Multi-roll stands

ABSTRACT

A multi-roll stand provided with two positively driven backing rolls and two working rolls frictionally driven by the backing rolls, in which the working rolls are displaced, for their horizontal support, with their axes out of the vertical plane containing the axes of the backing rolls, and intermediate rolls and supporting rollers journalled in supporting bridges provide further horizontal support for the working rolls. Means are provided for adjusting the lateral distance of the individual supporting rollers from the plane containing the axes of the backing rolls.

. United States Patent Leifeld et a1. 1 51 Oct. 3, 1972 [54] MULTI-ROLLSTANDS 2,927,489 3/1960 Teutsch ..72/243 3,003,373 10/1961 Volkhausen .l72/243 [721 i 3,373,590 3/1968 Knappe ..72/243 wmhnik Ostemth 3 533 263 10/1970 Wochnik 72/243 Seldom allofeermany 1.

[73] Assignee: Schloemann Aktieng esellschaft, Dus- Primary Examiner- Milton S. Mehr seldorf, Germany AttorneyHolman & Stern [22] Filed: May 14, 1970 [57] ABSTRACT I [21] Appl' 37105 A multi-roll stand provided with two positively driven Related Application Data backing rolls and two working rolls frictionally driven by the backing rolls, in which the working rolls are DlVlSlOn 0f 647,451, June 20, 1967, displaced, for their horizontal support, with their axes Pat. out of the vertical plane containing the axes of the backing rolls, and intermediate rolls and supporting [52] US. Cl "72/243 r llers journalled in supporting bridges provide further [51] Int. Cl. ..B21b 31/16 horizontal support for the working rolls. Means are [58] Field of Search ..'.72/241, 242, 243, 250, 237, provided for adjusting the lateral distance of the in- 72/244, 245 dividual supporting rollers from'the plane containing the axes of the backing rolls. 56 R f Gt (1 1 e e 4 Claims, 2 Drawing Figures UNITED STATES PATENTS 4/1933 Biggert et al. ..72/237 BACKGROUND OF THE. INVENTION This application is a division of our co-pending application Ser. No. 647,451 filedJune 20, 1967 now US.

Pat. No. 3,546,914 issued Dec. 15, 1970 and entitled 'Multi-Roll Stands.

The invention relates to a multi-roll stand with two positively driven backing rolls, and two working rolls frictionally driven by the backing rolls. For taking up the horizontal forces acting upon the working rolls and I conditioned by the frictional drive in such cases, it is,

' For the purpose of obtaining rolled stock of uniform cross-section, use is made of working rolls in which body diameter increases by a small amount towards the middle. This camber must be adapted to the bending and flattening of the rolls under the particular rolling conditions, so that a plurality of pairs of working rolls must always be kept available. For the body correction during the rolling operation, it is also known to cool the bodies of the rolls more strongly laterally than in the middle, or conversely. This method however. is not sufficiently precise, and is associated with some delay. The

BRIEF DESCRIPTION or THE DRAWINGS FIG. 1 is a view in vertical section through a roll stand with adjusting wedges; and

FIG. 2 is a view looking at FIG. 3 in the direction towards a row of wedges bearing on the supporting bridge with their adjusting means.

In the multi-roll stand illustrated in FIGS. 1 and 2, two working rolls 40 are supported perpendicularly against backing and driving rolls 42 journalled in chocks 41, with the axes of the working rolls being displaced from the vertical backing-roll plane. In the direction of this displacement, the working rolls 40 are supported, by way of intermediate rolls 43, on supporting rollers 44 (one set to each working roll) journalled in bearing plates 45, which are connected by a bolt 46.

vThe bearing plates 45 are held by fluid-pressure invention described is particularly suitable for roll stands up to a breadth limited by the magnitude of the forces occurring. In the case, more particularly, of very wide rolling mills, it is advantageous, according to the.

invention, to provide between the bearings of each supporting roller, or, between the bearings of groups of supporting rollers and the supporting bridges, wedges .which are connected with adjusting elements, and

which jointly form, according to the wedge angle and the position of the wedges relatively to one another in each case, a bearing contact'extending positively or negatively according to a symmetrical are, for the bearings of the supporting rollers. In a known roll stand, wedge-pieces are already arranged between the bearings of the supporting rollers and the supporting bridges. These, however, serve the purpose of an axially parallel adjusting of the supporting rollers during the stoppage, and not of a change in the lateral distance in the direction of a deflection, for the correction of camber during the rollingoperation.

According to a further feature of the invention,

' wedges differing in the wedge angle are so arranged that those with the greatest angle bear in the middle of the supporting bridge, and with these are associated on both sides, wedges of a progressively diminishing angle, with the wedges being connected with pistonrods or connecting-rods which are supported upon an eccentric shaft rockable by hydraulic means by way of a lever. The actuation of the shifting cylinder thus yields, symmetrically about the center of the rolling path, the adjusting travels requisite for the desired deflection of the working rolls.

. Further objects and advantages of the invention will become more readily apparent from the following detailed description and drawings, in which;

cylinder-piston units 47 against supporting beams 48 connected with the chocks 41. For taking up the horizontal supporting forces, supporting bridges 49 connect the housings and wedges 50 or 52 secured to the supporting bridge are arranged between the supporting bridges and bearing plates 45. Also, movable adjusting wedges 51 or 53 are provided.

The position of two outer adjusting wedges 53 is variable by means of intervening layers 54 and can be fixed by means of screws 55, in order to straighten the supporting rollers 44 with their axes parallel during stoppage. Y

The inneradjusting wedges 51 are connected with mover means in the form of piston-rods or connectingrods 56, which are accommodated upon an eccentric shaft 57, which is journalled upon the supporting bridge 49. Upon the eccentric shaft are anchored levels 58, which are connected with hydraulic cylinders 59 having piston-rods 60 thereof pivoted to the supporting bridge 49. I

Of theadjusting wedges 51 actuated by the eccentric shaft 57-, the two inner ones have a greater inclination than the other ones. The differing inclinations of the wedges means that when pressure fluid is supplied to the cylinders 59, their contact surfaces designed for the bearing plates 45 extend in an arc. This causes each set of supporting rollers 44 todefine generally a symmetri- .ca] curvature.

Upon loading the working rolls 40, these rolls are pressed by the lateral forces, with the intermediate rolls '43, against the supporting rollers 44, and are thus positively or negatively deflected in a lateral direction, whereby the height of the roll gap is varied over the body breadth. In this manner also the most advantageous distribution of pressure can be obtained for the attainment of a rectangular rolled-stock cross-section.

Iclaim:

l. A rnulti-roll stand, comprising: roll housings, supporting bridges connecting the roll housings, two positively driven backing rolls, the axes of the working rolls being displaced from the vertical plane containing the axes of the backing rolls for the horizontal support of the working rolls, bearing plates, two sets of supporting rollers, one for each working roll, having bearings journalled in the said bearing plates, intermediate rolls interposed between the working rolls and the supporting rollers to afford horizontal support to the working rolls,

wedges secured to the supporting bridges and located between the supporting bridges and the bearing plates, mover means, and adjusting wedges movable by said mover means cooperable with said secured wedges whereby, according to their wedge angles and the relative positions of the secured wedges to the adjusting wedges, each set of supporting rollers generally defines a symmetrical curve.

2. The multi-roll stand as claimed in claim 1 in which wedges provided with different wedge angles are so arranged that the wedges having the greatest wedge angle are located and bear on the middle of the supporting bridges while the wedges having the smaller wedge angle are located and bear on the supporting bridges toward each end thereof.

bridge, connecting means operably related to the shaftand the adjusting wedges, hydraulic cylinders and levers coupled with the shaft and cylinders whereby actuation of the cylinders imparts rocking movement to the shaft. 

1. A multi-roll stand, comprising: roll housings, supporting bridges connecting the roll housings, two positively driven backing rolls, the axes of the working rolls being displaced from the vertical plane containing the axes of the backing rolls for the horizontal support of the working rolls, bearing plates, two sets of supporting rollers, one for each working roll, having bearings journalled in the said bearing plates, intermediate rolls interposed between the working rolls and the supporting rollers to afford horizontal support to the working rolls, wedges secured to the supporting bridges and located between the supporting bridges and the bearing plates, mover means, and adjusting wedges movable by said mover means cooperable with said secured wedges whereby, according to their weDge angles and the relative positions of the secured wedges to the adjusting wedges, each set of supporting rollers generally defines a symmetrical curve.
 2. The multi-roll stand as claimed in claim 1 in which wedges provided with different wedge angles are so arranged that the wedges having the greatest wedge angle are located and bear on the middle of the supporting bridges while the wedges having the smaller wedge angle are located and bear on the supporting bridges toward each end thereof.
 3. The multi-roll stand as claimed in claim 2 including an eccentric rockable shaft for each supporting bridge, connecting means operably related to the shaft and the adjusting wedges, hydraulic cylinders and levers coupled with the shaft and cylinders whereby actuation of the cylinders imparts rocking movement to the shaft.
 4. The multi-roll stand as claimed in claim 1 including an eccentric rockable shaft for each supporting bridge, connecting means operably related to the shaft and the adjusting wedges, hydraulic cylinders and levers coupled with the shaft and cylinders whereby actuation of the cylinders imparts rocking movement to the shaft. 